1 files changed, 291 insertions, 0 deletions
diff --git a/vendor/git2-curl/src/lib.rs b/vendor/git2-curl/src/lib.rs
new file mode 100644
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+++ b/vendor/git2-curl/src/lib.rs
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+//! A crate for using libcurl as a backend for HTTP git requests with git2-rs.
+//!
+//! This crate provides one public function, `register`, which will register
+//! a custom HTTP transport with libcurl for any HTTP requests made by libgit2.
+//! At this time the `register` function is unsafe for the same reasons that
+//! `git2::transport::register` is also unsafe.
+//!
+//! It is not recommended to use this crate wherever possible. The current
+//! libcurl backend used, `curl-rust`, only supports executing a request in one
+//! method call implying no streaming support. This consequently means that
+//! when a repository is cloned the entire contents of the repo are downloaded
+//! into memory, and *then* written off to disk by libgit2 afterwards. It
+//! should be possible to alleviate this problem in the future.
+//!
+//! > **NOTE**: At this time this crate likely does not support a `git push`
+//! >           operation, only clones.
+
+#![doc(html_root_url = "https://docs.rs/git2-curl/0.19")]
+#![deny(missing_docs)]
+#![warn(rust_2018_idioms)]
+#![cfg_attr(test, deny(warnings))]
+
+use std::error;
+use std::io::prelude::*;
+use std::io::{self, Cursor};
+use std::str;
+use std::sync::{Arc, Mutex, Once};
+
+use curl::easy::{Easy, List};
+use git2::transport::SmartSubtransportStream;
+use git2::transport::{Service, SmartSubtransport, Transport};
+use git2::Error;
+use log::{debug, info};
+use url::Url;
+
+struct CurlTransport {
+    handle: Arc<Mutex<Easy>>,
+    /// The URL of the remote server, e.g. "https://github.com/user/repo"
+    ///
+    /// This is an empty string until the first action is performed.
+    /// If there is an HTTP redirect, this will be updated with the new URL.
+    base_url: Arc<Mutex<String>>,
+}
+
+struct CurlSubtransport {
+    handle: Arc<Mutex<Easy>>,
+    service: &'static str,
+    url_path: &'static str,
+    base_url: Arc<Mutex<String>>,
+    method: &'static str,
+    reader: Option<Cursor<Vec<u8>>>,
+    sent_request: bool,
+}
+
+/// Register the libcurl backend for HTTP requests made by libgit2.
+///
+/// This function takes one parameter, a `handle`, which is used to perform all
+/// future HTTP requests. The handle can be previously configured with
+/// information such as proxies, SSL information, etc.
+///
+/// This function is unsafe largely for the same reasons as
+/// `git2::transport::register`:
+///
+/// * The function needs to be synchronized against all other creations of
+///   transport (any API calls to libgit2).
+/// * The function will leak `handle` as once registered it is not currently
+///   possible to unregister the backend.
+///
+/// This function may be called concurrently, but only the first `handle` will
+/// be used. All others will be discarded.
+pub unsafe fn register(handle: Easy) {
+    static INIT: Once = Once::new();
+
+    let handle = Arc::new(Mutex::new(handle));
+    let handle2 = handle.clone();
+    INIT.call_once(move || {
+        git2::transport::register("http", move |remote| factory(remote, handle.clone())).unwrap();
+        git2::transport::register("https", move |remote| factory(remote, handle2.clone())).unwrap();
+    });
+}
+
+fn factory(remote: &git2::Remote<'_>, handle: Arc<Mutex<Easy>>) -> Result<Transport, Error> {
+    Transport::smart(
+        remote,
+        true,
+        CurlTransport {
+            handle: handle,
+            base_url: Arc::new(Mutex::new(String::new())),
+        },
+    )
+}
+
+impl SmartSubtransport for CurlTransport {
+    fn action(
+        &self,
+        url: &str,
+        action: Service,
+    ) -> Result<Box<dyn SmartSubtransportStream>, Error> {
+        let mut base_url = self.base_url.lock().unwrap();
+        if base_url.len() == 0 {
+            *base_url = url.to_string();
+        }
+        let (service, path, method) = match action {
+            Service::UploadPackLs => ("upload-pack", "/info/refs?service=git-upload-pack", "GET"),
+            Service::UploadPack => ("upload-pack", "/git-upload-pack", "POST"),
+            Service::ReceivePackLs => {
+                ("receive-pack", "/info/refs?service=git-receive-pack", "GET")
+            }
+            Service::ReceivePack => ("receive-pack", "/git-receive-pack", "POST"),
+        };
+        info!("action {} {}", service, path);
+        Ok(Box::new(CurlSubtransport {
+            handle: self.handle.clone(),
+            service: service,
+            url_path: path,
+            base_url: self.base_url.clone(),
+            method: method,
+            reader: None,
+            sent_request: false,
+        }))
+    }
+
+    fn close(&self) -> Result<(), Error> {
+        Ok(()) // ...
+    }
+}
+
+impl CurlSubtransport {
+    fn err<E: Into<Box<dyn error::Error + Send + Sync>>>(&self, err: E) -> io::Error {
+        io::Error::new(io::ErrorKind::Other, err)
+    }
+
+    fn execute(&mut self, data: &[u8]) -> io::Result<()> {
+        if self.sent_request {
+            return Err(self.err("already sent HTTP request"));
+        }
+        let agent = format!("git/1.0 (git2-curl {})", env!("CARGO_PKG_VERSION"));
+
+        // Parse our input URL to figure out the host
+        let url = format!("{}{}", self.base_url.lock().unwrap(), self.url_path);
+        let parsed = Url::parse(&url).map_err(|_| self.err("invalid url, failed to parse"))?;
+        let host = match parsed.host_str() {
+            Some(host) => host,
+            None => return Err(self.err("invalid url, did not have a host")),
+        };
+
+        // Prep the request
+        debug!("request to {}", url);
+        let mut h = self.handle.lock().unwrap();
+        h.url(&url)?;
+        h.useragent(&agent)?;
+        h.follow_location(true)?;
+        match self.method {
+            "GET" => h.get(true)?,
+            "PUT" => h.put(true)?,
+            "POST" => h.post(true)?,
+            other => h.custom_request(other)?,
+        }
+
+        let mut headers = List::new();
+        headers.append(&format!("Host: {}", host))?;
+        if data.len() > 0 {
+            h.post_fields_copy(data)?;
+            headers.append(&format!(
+                "Accept: application/x-git-{}-result",
+                self.service
+            ))?;
+            headers.append(&format!(
+                "Content-Type: \
+                 application/x-git-{}-request",
+                self.service
+            ))?;
+        } else {
+            headers.append("Accept: */*")?;
+        }
+        headers.append("Expect:")?;
+        h.http_headers(headers)?;
+
+        let mut content_type = None;
+        let mut data = Vec::new();
+        {
+            let mut h = h.transfer();
+
+            // Look for the Content-Type header
+            h.header_function(|header| {
+                let header = match str::from_utf8(header) {
+                    Ok(s) => s,
+                    Err(..) => return true,
+                };
+                let mut parts = header.splitn(2, ": ");
+                let name = parts.next().unwrap();
+                let value = match parts.next() {
+                    Some(value) => value,
+                    None => return true,
+                };
+                if name.eq_ignore_ascii_case("Content-Type") {
+                    content_type = Some(value.trim().to_string());
+                }
+
+                true
+            })?;
+
+            // Collect the request's response in-memory
+            h.write_function(|buf| {
+                data.extend_from_slice(buf);
+                Ok(buf.len())
+            })?;
+
+            // Send the request
+            h.perform()?;
+        }
+
+        let code = h.response_code()?;
+        if code != 200 {
+            return Err(self.err(
+                &format!(
+                    "failed to receive HTTP 200 response: \
+                     got {}",
+                    code
+                )[..],
+            ));
+        }
+
+        // Check returned headers
+        let expected = match self.method {
+            "GET" => format!("application/x-git-{}-advertisement", self.service),
+            _ => format!("application/x-git-{}-result", self.service),
+        };
+        match content_type {
+            Some(ref content_type) if *content_type != expected => {
+                return Err(self.err(
+                    &format!(
+                        "expected a Content-Type header \
+                         with `{}` but found `{}`",
+                        expected, content_type
+                    )[..],
+                ))
+            }
+            Some(..) => {}
+            None => {
+                return Err(self.err(
+                    &format!(
+                        "expected a Content-Type header \
+                         with `{}` but didn't find one",
+                        expected
+                    )[..],
+                ))
+            }
+        }
+
+        // Ok, time to read off some data.
+        let rdr = Cursor::new(data);
+        self.reader = Some(rdr);
+
+        // If there was a redirect, update the `CurlTransport` with the new base.
+        if let Ok(Some(effective_url)) = h.effective_url() {
+            let new_base = if effective_url.ends_with(self.url_path) {
+                // Strip the action from the end.
+                &effective_url[..effective_url.len() - self.url_path.len()]
+            } else {
+                // I'm not sure if this code path makes sense, but it's what
+                // libgit does.
+                effective_url
+            };
+            *self.base_url.lock().unwrap() = new_base.to_string();
+        }
+
+        Ok(())
+    }
+}
+
+impl Read for CurlSubtransport {
+    fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
+        if self.reader.is_none() {
+            self.execute(&[])?;
+        }
+        self.reader.as_mut().unwrap().read(buf)
+    }
+}
+
+impl Write for CurlSubtransport {
+    fn write(&mut self, data: &[u8]) -> io::Result<usize> {
+        if self.reader.is_none() {
+            self.execute(data)?;
+        }
+        Ok(data.len())
+    }
+    fn flush(&mut self) -> io::Result<()> {
+        Ok(())
+    }
+}